Ozone depletion, seasonal, and weather variations cause different amounts of UV radiation to reach the Earth at any given time. The UV Index is a numeric indication of the expected risk of overexposure to the sun, on a scale of 1 to 11+, where 1 indicates a minimal risk of overexposure and 11+ means a very high risk. EPA provides a daily forecast for solar noon - when the sun is at its highest overhead - and an hourly forecast for 8 a.m. until 5 p.m. UV levels change throughout the day. The hourly forecast allows you to plan your outdoor activities accordingly.
The UV Index provides important information to help you plan your outdoor activities and prevent overexposure to the sun's rays. By taking a few simple precautions, you can greatly reduce your risk of sun-related illnesses. Consider the following steps: